// 生成随机字符串
export default function (len = 32) {
    const $chars = `abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890`
    const maxPos = $chars.length
    let str = ""
    for (let i = 0; i < len; i++) {
      str += $chars.charAt(Math.floor(Math.random() * maxPos))
    }
    return str
  }